Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionMontag A & Associates Inc
Latest Disclosed Ownership22,230 shares
Latest Disclosed Value $ 2,729,400
Montag A & Associates Inc ownership in ANET / Arista Networks, Inc.

On April 29, 2026 - Montag A & Associates Inc filed a 13F-HR form disclosing ownership of 22,230 shares of Arista Networks, Inc. (MX:ANET) valued at $2,729,400 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 21,580 shares of Arista Networks, Inc.. This represents a change in shares of 3.01% during the quarter.

Montag A & Associates Inc has a history of taking positions in derivatives of the underlying security (ANET) in the form of stock options.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:ANET / Arista Networks, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-04-29 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 22,230 650 3.01 2,729 -3.47 0.1267
2026-02-02 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 21,580 987 4.79 2,828 -5.77 0.1290
2025-11-12 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 20,593 1,244 6.43 3,001 51.59 0.1380
2025-08-07 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 19,349 12,176 169.75 1,980 256.58 0.0964
2025-05-05 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 7,173 3,872 117.30 556 52.47 0.0278
2025-01-30 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 3,301 2,476 300.12 365 15.19 0.0173
2024-11-05 2024-09-30 13F ARISTA NETWORKS COM 040413106 825 -49 -5.61 317 3.27 0.0150
2024-07-31 2024-06-30 13F ARISTA NETWORKS COM 040413106 874 87 11.05 306 34.21 0.0155
2024-05-07 2024-03-31 13F ARISTA NETWORKS COM 040413106 787 -3 -0.38 228 22.58 0.0114
2024-02-07 2023-12-31 13F ARISTA NETWORKS COM 040413106 790 137 20.98 186 55.00 0.0104
2023-11-09 2023-09-30 13F ARISTA NETWORKS COM 040413106 653 0 0.00 120 14.29 0.0076
2023-08-09 2023-06-30 13F ARISTA NETWORKS COM 040413106 653 0 0.00 106 -3.67 0.0065
2023-05-11 2023-03-31 13F ARISTA NETWORKS COM 040413106 653 -1 -0.15 110 37.97 0.0072
2023-02-02 2022-12-31 13F ARISTA NETWORKS COM 040413106 654 6 0.93 79 8.22 0.0053
2022-11-09 2022-09-30 13F ARISTA NETWORKS COM 040413106 648 -168 -20.59 73 -3.95 0.0051
2022-08-10 2022-06-30 13F ARISTA NETWORKS COM 040413106 816 0 0.00 76 -32.74 0.0049
2022-05-02 2022-03-31 13F ARISTA NETWORKS COM 040413106 816 0 0.00 113 -3.42 0.0060
2022-02-09 2021-12-31 13F ARISTA NETWORKS COM 040413106 816 816 117 0.0058
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-11-12 2025-09-30 13F ARISTA NETWORKS CALL Call 248 42.77 n/a n/a n/a
2025-08-07 2025-06-30 13F ARISTA NETWORKS CALL Call 174 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.